Action games
If you don't play games that much, there is a big chance you have played an action game, e.g. a shooter, at some point. This category is full of games that won't let you get bored.
Eight Legged Freaks
Starcraft Flash Action
Piranha Panic
Project Torque
Total Tank Simulator
Vietcong
Battlelog.co Launcher
Skulltag
Adventure Ball
Battle Rush
Soldat Release Candidate
BrainBread
Subway
Warface My.Com
AfterWorld
3d shooter
Me Alone 2
Asteroids
DrugDealerRenegade
MACROSS VO
Freelancer: Crossfire
Dragon Ball Z : Extreme Mugen
Alien Abduction
Rocket Shooter Cast
Bloons TD Battles
Aerial Fire
Z Expansion Kit
ZDaemon
Discover FDM
Add-on support
You can get add-ons that download files/video from arbitrary websites.